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annotate include/SDL_assert.h @ 4542:af1d018ebbe6

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Better fix for bug 936 Check to for overruns before they happen instead of afterwards.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Jul 2010 10:26:46 -0700
parents f7b03b6838cb
children d306007299ac
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifndef _SDL_assert_h
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24 #define _SDL_assert_h
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25
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26 #include "SDL_config.h"
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27
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28 #include "begin_code.h"
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29 /* Set up for C function definitions, even when using C++ */
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30 #ifdef __cplusplus
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31 /* *INDENT-OFF* */
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32 extern "C" {
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33 /* *INDENT-ON* */
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34 #endif
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35
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36 #ifndef SDL_ASSERT_LEVEL
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37 #ifdef SDL_DEFAULT_ASSERT_LEVEL
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38 #define SDL_ASSERT_LEVEL SDL_DEFAULT_ASSERT_LEVEL
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39 #elif defined(_DEBUG) || defined(DEBUG) || \
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40 (defined(__GNUC__) && !defined(__OPTIMIZE__))
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41 #define SDL_ASSERT_LEVEL 2
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42 #else
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43 #define SDL_ASSERT_LEVEL 1
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44 #endif
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45 #endif /* SDL_ASSERT_LEVEL */
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46
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47 /*
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48 These are macros and not first class functions so that the debugger breaks
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49 on the assertion line and not in some random guts of SDL, and so each
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50 assert can have unique static variables associated with it.
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51 */
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52
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53 #if (defined(_MSC_VER) && ((_M_IX86) || (_M_X64)))
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54 #define SDL_TriggerBreakpoint() __asm { int 3 }
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55 #elif (defined(__GNUC__) && ((__i386__) || (__x86_64__)))
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56 #define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "int $3\n\t" )
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57 #elif defined(HAVE_SIGNAL_H)
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58 #include <signal.h>
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59 #define SDL_TriggerBreakpoint() raise(SIGTRAP)
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60 #else
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61 /* How do we trigger breakpoints on this platform? */
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62 #define SDL_TriggerBreakpoint()
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63 #endif
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64
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65 #if (__STDC_VERSION__ >= 199901L) /* C99 supports __func__ as a standard. */
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66 # define SDL_FUNCTION __func__
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67 #elif ((__GNUC__ >= 2) || defined(_MSC_VER))
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68 # define SDL_FUNCTION __FUNCTION__
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69 #else
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70 # define SDL_FUNCTION "???"
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71 #endif
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72 #define SDL_FILE __FILE__
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73 #define SDL_LINE __LINE__
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74
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75 /*
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76 sizeof (x) makes the compiler still parse the expression even without
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77 assertions enabled, so the code is always checked at compile time, but
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78 doesn't actually generate code for it, so there are no side effects or
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79 expensive checks at run time, just the constant size of what x WOULD be,
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80 which presumably gets optimized out as unused.
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81 This also solves the problem of...
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82
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83 int somevalue = blah();
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84 SDL_assert(somevalue == 1);
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85
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86 ...which would cause compiles to complain that somevalue is unused if we
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87 disable assertions.
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88 */
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89
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90 #define SDL_disabled_assert(condition) \
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91 do { (void) sizeof ((condition)); } while (0)
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92
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93 #if (SDL_ASSERT_LEVEL > 0)
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94
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95 typedef enum
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96 {
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97 SDL_ASSERTION_RETRY, /**< Retry the assert immediately. */
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98 SDL_ASSERTION_BREAK, /**< Make the debugger trigger a breakpoint. */
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99 SDL_ASSERTION_ABORT, /**< Terminate the program. */
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100 SDL_ASSERTION_IGNORE, /**< Ignore the assert. */
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101 SDL_ASSERTION_ALWAYS_IGNORE, /**< Ignore the assert from now on. */
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102 } SDL_assert_state;
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103
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104 typedef struct SDL_assert_data
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105 {
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106 int always_ignore;
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107 unsigned int trigger_count;
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108 const char *condition;
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109 const char *filename;
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110 int linenum;
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111 const char *function;
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112 const struct SDL_assert_data *next;
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113 } SDL_assert_data;
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114
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115 /* Never call this directly. Use the SDL_assert* macros. */
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116 extern DECLSPEC SDL_assert_state SDLCALL SDL_ReportAssertion(SDL_assert_data *,
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117 const char *,
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118 const char *, int);
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119
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120 /* the do {} while(0) avoids dangling else problems:
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121 if (x) SDL_assert(y); else blah();
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122 ... without the do/while, the "else" could attach to this macro's "if".
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123 We try to handle just the minimum we need here in a macro...the loop,
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124 the static vars, and break points. The heavy lifting is handled in
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125 SDL_ReportAssertion(), in SDL_assert.c.
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126 */
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127 #define SDL_enabled_assert(condition) \
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128 do { \
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129 while ( !(condition) ) { \
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130 static struct SDL_assert_data assert_data = { \
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131 0, 0, #condition, 0, 0, 0, 0 \
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132 }; \
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133 const SDL_assert_state state = SDL_ReportAssertion(&assert_data, \
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134 SDL_FUNCTION, \
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135 SDL_FILE, \
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136 SDL_LINE); \
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137 if (state == SDL_ASSERTION_RETRY) { \
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138 continue; /* go again. */ \
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139 } else if (state == SDL_ASSERTION_BREAK) { \
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140 SDL_TriggerBreakpoint(); \
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141 } \
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142 break; /* not retrying. */ \
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143 } \
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144 } while (0)
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145
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146 #endif /* enabled assertions support code */
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147
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148 /* Enable various levels of assertions. */
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149 #if SDL_ASSERT_LEVEL == 0 /* assertions disabled */
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150 # define SDL_assert(condition) SDL_disabled_assert(condition)
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151 # define SDL_assert_release(condition) SDL_disabled_assert(condition)
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152 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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153 #elif SDL_ASSERT_LEVEL == 1 /* release settings. */
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154 # define SDL_assert(condition) SDL_disabled_assert(condition)
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155 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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156 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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157 #elif SDL_ASSERT_LEVEL == 2 /* normal settings. */
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158 # define SDL_assert(condition) SDL_enabled_assert(condition)
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159 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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160 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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161 #elif SDL_ASSERT_LEVEL == 3 /* paranoid settings. */
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162 # define SDL_assert(condition) SDL_enabled_assert(condition)
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163 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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164 # define SDL_assert_paranoid(condition) SDL_enabled_assert(condition)
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165 #else
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166 # error Unknown assertion level.
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167 #endif
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168
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169
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170 typedef SDL_assert_state (SDLCALL *SDL_AssertionHandler)(
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171 const SDL_assert_data *, void *userdata);
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172
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173 /**
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174 * \brief Set an application-defined assertion handler.
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175 *
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176 * This allows an app to show its own assertion UI and/or force the
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177 * response to an assertion failure. If the app doesn't provide this, SDL
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178 * will try to do the right thing, popping up a system-specific GUI dialog,
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179 * and probably minimizing any fullscreen windows.
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180 *
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181 * This callback may fire from any thread, but it runs wrapped in a mutex, so
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182 * it will only fire from one thread at a time.
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183 *
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184 * Setting the callback to NULL restores SDL's original internal handler.
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185 *
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186 * This callback is NOT reset to SDL's internal handler upon SDL_Quit()!
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187 *
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188 * \return SDL_assert_state value of how to handle the assertion failure.
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189 *
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190 * \param handler Callback function, called when an assertion fails.
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191 * \param userdata A pointer passed to the callback as-is.
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192 */
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193 extern DECLSPEC void SDLCALL SDL_SetAssertionHandler(
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194 SDL_AssertionHandler handler,
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195 void *userdata);
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196
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197 /**
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198 * \brief Get a list of all assertion failures.
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199 *
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200 * Get all assertions triggered since last call to SDL_ResetAssertionReport(),
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201 * or the start of the program.
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202 *
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203 * The proper way to examine this data looks something like this:
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204 *
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205 * <code>
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206 * const SDL_assert_data *item = SDL_GetAssertionReport();
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207 * while (item->condition) {
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208 * printf("'%s', %s (%s:%d), triggered %u times, always ignore: %s.\n",
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209 * item->condition, item->function, item->filename,
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210 * item->linenum, item->trigger_count,
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211 * item->always_ignore ? "yes" : "no");
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212 * item = item->next;
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213 * }
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214 * </code>
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215 *
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216 * \return List of all assertions. This never returns NULL,
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217 * even if there are no items.
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218 * \sa SDL_ResetAssertionReport
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219 */
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220 extern DECLSPEC const SDL_assert_data * SDLCALL SDL_GetAssertionReport(void);
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221
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222 /**
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223 * \brief Reset the list of all assertion failures.
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224 *
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225 * Reset list of all assertions triggered.
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226 *
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227 * \sa SDL_GetAssertionReport
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228 */
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229 extern DECLSPEC void SDLCALL SDL_ResetAssertionReport(void);
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230
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231 /* Ends C function definitions when using C++ */
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232 #ifdef __cplusplus
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233 /* *INDENT-OFF* */
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234 }
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235 /* *INDENT-ON* */
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236 #endif
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237 #include "close_code.h"
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238
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239 #endif /* _SDL_assert_h */
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240
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241 /* vi: set ts=4 sw=4 expandtab: */